Method for leaching positive-negative pole material mixture of waste nickel-metal hydride battery
A nickel-metal hydride waste battery and mixed material technology, applied in the direction of improving process efficiency, etc., can solve the problems of uneconomical use of industrial pure oxygen, complex leaching equipment, and low amount of industrial pure oxygen, etc., and achieve obvious economic and environmental benefits , Reduce pollution control costs, improve the effect of metal leaching rate
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Embodiment 1
[0022] Example 1: Add 100g of the positive and negative mixed materials of nickel-metal hydride waste batteries (containing 55.3% nickel, 6.2% cobalt, and 12.5% rare earth) and 37g of bamboo chips ≤ 1.5mm into a titanium-lined pressure reaction with a volume of 2L. Add 870ml of mixed acid solution with a concentration of sulfuric acid of 1.5mol / L and a concentration of nitric acid of 5g / L into the kettle, leaching at 50°C to 60°C with closed stirring (stirring speed 80r / min) for 4 hours, and liquid-solid separation after leaching. Obtain 840ml leaching solution (excluding leaching slag washing water). The leaching rates of nickel, cobalt and rare earths are 99.1%, 98.7% and 8.5% respectively (calculated based on nickel, cobalt and rare earths entering the leaching solution and leaching slag washing solution).
Embodiment 2
[0023] Example 2: 500g of mixed positive and negative electrode materials of waste nickel-metal hydride batteries (containing 55.3% nickel, 6.2% cobalt, and 12.5% rare earth) and 230g of bamboo chips ≤ 1.5mm were added to a titanium-lined pressure reaction with a volume of 5L. Add 2700ml of mixed acid solution with a concentration of sulfuric acid of 3.0mol / L and a concentration of nitric acid of 10g / L in the kettle, and leaching at 70°C to 80°C (stirring speed 70r / min) for 2.0h, and liquid-solid separation after leaching , to obtain 2400ml leaching solution (excluding leaching slag washing water). The leaching rates of nickel, cobalt and rare earths are 99.4%, 99.3% and 7.5% respectively (calculated based on nickel, cobalt and rare earths entering the leaching solution and leaching slag washing solution).
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